Optical Camera Lens

ABSTRACT

The present disclosure relates to the field of optical lens, and discloses an optical camera lens, which, from an object side to an image side, successively includes: an aperture, a first lens having positive refraction power, a second lens having negative refraction power, a third lens having positive refraction power, a fourth lens having negative refraction power, a fifth lens having positive refraction power, and a sixth lens having negative refraction power, which satisfy following relational expressions: 0.7&lt;f1/f&lt;0.8; −2&lt;f2/f&lt;−1.8; 1.9&lt;f3/f&lt;2.1; −2.6&lt;f4/f&lt;−2.2; 0.8&lt;f5/f&lt;1; −0.7&lt;f6/f&lt;−0.5; 1.9&lt;f3/f5&lt;2.2. The optical camera lens provided by the present disclosure can meet the design requirements on large aperture meanwhile shortening the total track length of the optical camera lens, thus achieving good sensitivity performance.

TECHNICAL FIELD

The present disclosure relates to the field of optical lens and,particularly, relates to an optical camera lens adapted for portableterminal devices such as smart cellphone, digital camera etc. and forcamera devices such as monitor, PC lens etc.

BACKGROUND

In recent years, as the booming development of the smart cellphone, theneed on miniaturized camera lens is increasing gradually. However, thephotosensitive component of a conventional camera lens is either acharge coupled device (Charge Coupled Device, CCD) or a complementarymetallic-oxide semiconductor sensor (Complementary Metal-OxideSemiconductor Sensor, CMOS Sensor). With the development ofsemiconductor processing technique, pixel size of the photosensitivecomponent is reduced. In addition, the electronic product at present isdeveloped to have better functions and a lighter and thinnerconfiguration. Therefore, a miniaturized camera lens with better imagingquality has already become the mainstream in the current market.

In order to obtain better imaging quality, a traditional lens carried ina cellphone camera usually adopts a three-lens or four-lens structure.As the development of techniques and increasing of user's diversifiedneeds, in the situation of the pixel area of the photosensitivecomponent being reduced, and the requirements of the system on imagingquality being increased constantly, a six-lens structure appears in thelens design gradually.

However, the normal six-lens structure cannot satisfy the design needson low total track length (Total Track Length, TTL) and large aperture.

BRIEF DESCRIPTION OF DRAWINGS

Many aspects of the exemplary embodiments can be better understood withreference to the following drawings. The components in the drawings arenot necessarily drawn to scale, the emphasis instead being placed uponclearly illustrating the principles of the present disclosure. Moreover,in the drawings, like reference numerals designate corresponding partsthroughout the several views.

FIG. 1 is a structural schematic diagram of an optical camera lensaccording to an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic diagram of axial chromatic aberration of anoptical camera lens shown in FIG. 1;

FIG. 3 is a schematic diagram of ratio chromatic aberration of anoptical camera lens shown in FIG. 1;

FIG. 4 is a schematic diagram of astigmatism field curvature anddistortion of an optical camera lens shown in FIG. 1;

DESCRIPTION OF EMBODIMENTS

In order to make objectives, technical solutions and advantages of thepresent disclosure more clearly, embodiments of the present disclosurewill be illustrated in detail with reference to the accompanyingdrawings. Those skilled in the art should understand, in eachimplementing manner of the present disclosure, in order to make thereader understand the present disclosure, a plurality of technicaldetails have been proposed. However, the technical solutions protectedby the present disclosure shall also be implemented without thesetechnical details and the various modifications and variations presentedin the embodiments.

Referring to the figures, the present disclosure provides an opticalcamera lens. FIG. 1 shows an optical camera lens 10 according to a firstembodiment of the present disclosure, the optical camera lens 10includes six lenses. Specifically, the optical camera lens 10, from anobject side to an image side, successively includes: an aperture St, afirst lens L1, a second lens L2, a third lens L3, a fourth lens L4, afifth lens L5 and a sixth lens L6. An optical component such as anoptical filter GF can be arranged between the sixth lens and an imagingsurface Si.

The first lens L1 has positive refraction power, an object-side surfacethereof bulges outward to be a convex surface, the aperture St isarranged between the object and the first lens L1. The second lens L2has negative refraction power, in the present embodiment, an image-sidesurface of the second lens L2 is a concave surface. The third lens L3has positive refraction power, in the present embodiment, an image-sidesurface of the third lens L3 is a convex surface. The fourth lens L4 hasnegative refraction power, in the present embodiment, an object-sidesurface of the fourth lens L4 is a concave surface, an image-sidesurface thereof is a convex surface. The fifth lens L5 has positiverefraction power, in the present embodiment, an object-side surface ofthe fifth lens L5 is a concave surface, an image-side surface thereof isa convex surface. The sixth lens L6 has negative refraction power, inthe present embodiment, an object-side surface of the sixth lens L6 is aconcave surface, which can effectively reduce field curvature of thesystem.

Herein, a focal length of the integral optical camera lens 10 is definedas f, a focal length of the first lens L1 is defined as f1, a focallength of the second lens L2 is defined as f2, a focal length of thethird lens L3 is defined as f3, a focal length of the fourth lens L4 isdefined as f4, a focal length of the fifth lens L5 is defined as f5 anda focal length of the sixth lens L6 is defined as f6. The f, f1, f2, f3,f4, f5 and f6 satisfy the following relational expressions:0.7<f1/f<0.8; −2<f2/f<−1.8; 1.9<f3/f<2.1; −2.6<f4/f<−2.2; 0.8<f5/f<1;−0.7<f6/f<−0.5; 1.9<f3/f5<2.2.

When the focal lengths of the optical camera lens 10 and each lens meetthe above relational expressions, the refraction power configuration ofeach lens can be controlled/adjusted, which is adaptive to effectivelycontrol the total track length of the system while correcting aberrationso as to guarantee imaging quality and, at the same time, meet thedesign requirements on large aperture, thereby achieving goodsensitivity performance.

Specifically, in an embodiment of the present disclosure, the focallength f1 of the first lens, the focal length f2 of the second lens, thefocal length f3 of the third lens, the focal length f4 of the fourthlens, the focal length f5 of the fifth lens and the focal length f6 ofthe sixth lens can be designed so as to satisfy the following relationalexpressions: 2.9<f1<3.1; −8<f2<−7; 7.5<f3<8.5 −10.5<f4<−9; 3<f5<4;−3<f6<−2, unit: millimeter (mm). Such a design can further shorten thetotal track length (TTL) of the integral optical camera lens 10, so asto maintain the characteristics of miniaturization.

Optionally, the total track length TTL of the optical camera lens 10according to an embodiment of the present disclosure is equal to or lessthan 4.3 mm. Such a design is more advantageous to achieve the largeaperture design of the optical camera lens 10. Optionally, in anembodiment of the present disclosure, a value F of the aperture of theoptical camera lens is equal to or less than 1.87, the optical cameralens 10 is an optical system with a relative large aperture, which canimprove imaging performance in a low irradiance environment.

In the optical camera lens 10 of the present disclosure, the lenses canbe made of glass or plastic, if the lens is made of glass, which canincrease the freedom of the refraction power configuration of theoptical system of the present disclosure, if the lens is made ofplastic, which can effectively reduce production cost.

In an embodiment of the present disclosure, all lenses are plasticlenses. Further, in a preferred embodiment of the present disclosure, arefractive index n1 of the first lens, a refractive index n2 of thesecond lens, a refractive index n3 of the third lens, a refractive indexn4 of the fourth lens, a refractive index n5 of the fifth lens and arefractive index n6 of the sixth lens can be designed to satisfy thefollowing relational expressions: 1.52<n1<1.56; 1.62<n2<1.68;1.52<n3<1.56; 1.62<n4<1.68; 1.52<n5<1.56; 1.52<n6<1.54. Such a design isadvantageous for an appropriate matching of the lenses with opticalplastic material, so that the optical camera lens 10 can obtain betterimaging quality.

It should be noted that, in an embodiment of the present disclosure, anabbe number v1 of the first lens, an abbe number v2 of the second lens,an abbe number v3 of the third lens, an abbe number v4 of the fourthlens, an abbe number v5 of the fifth lens and an abbe number v6 of thesixth lens can be designed to satisfy the following relationalexpressions: 50<v1<60; 20<v2<23; 50<v3<60; 20<v4<23; 50<v5<60; 50<v6<60.Such a design can suppress the phenomenon of optical chromaticaberration during imaging by the optical camera lens 10.

It should be understood that, the design solution of the refractiveindex of each lens and the design solution of the abbe number of eachlens can be combined with each other so as to be applied to the designof the optical camera lens 10. Thus, the second lens L2 and the fourthlens L4 adopt an optical material with high a refractive index and a lowabbe number, which can effectively reduce chromatic aberration of thecamera lens, and significantly improve imaging quality of the opticalcamera lens 10.

Besides, the surface of the lens can be an aspheric surface, theaspheric surface can be easily made into shapes other than sphericalsurface, so as to obtain more controlling varieties, which are used toeliminate aberration and thus reduce the number of the lens used,thereby can effectively reduce the total track length of the opticalcamera lens of the present disclosure. In an embodiment of the presentdisclosure, the object-side surface and the image-side surface of eachlens are all aspheric surfaces.

Optionally, an inflection point and/or a stationary point can beprovided on the object-side surface and/or the image-side surface of thelens, so as to satisfy the imaging needs on high quality, the specificimplementing solution is as follows.

The design data of the optical camera lens 10 according to Embodiment 1of the present disclosure is shown as follows.

Table 1 and Table 2 show the data of the optical camera lens 10according to Embodiment 1 of the present disclosure, in which, St is theaperture; R1, R2 are the object-side surface and the image-side surfaceof the first lens L1, respectively; R3, R4 are the object-side surfaceand the image-side surface of the second lens L2, respectively; R5, R6are the object-side surface and the image-side surface of the third lensL3, respectively; R7, R8 are the object-side surface and the image-sidesurface of the fourth lens L4, respectively; R9, R10 are the object-sidesurface and the image-side surface of the fifth lens L5, respectively;R11, R12 are the object-side surface and the image-side surface of thesixth lens L6, respectively; and R13, R14 are the object-side surfaceand the image-side surface of the optical filter GF, respectively.

d0: axial distance from the aperture St to the object-side surface ofthe first lens L1;

d1: axial thickness of the first lens L1;

d2: axial distance from the image-side surface of the first lens L1 tothe object-side surface of the second lens L2;

d3: axial thickness of the second lens L2;

d4: axial distance from the image-side surface of the second lens L2 tothe object-side surface of the third lens L3;

d5: axial thickness of the third lens L3;

d6: axial distance from the image-side surface of the third lens L3 tothe object-side surface of the fourth lens L4;

d7: axial thickness of the fourth lens L4;

d8: axial distance from the image-side surface of the fourth lens L4 tothe object-side surface of the fifth lens L5;

d9: axial thickness of the fifth lens L5;

d10: axial distance from the image-side surface of the fifth lens L5 tothe object-side surface of the optical filter GF;

d11: axial thickness of the optical filter GF;

d12: axial distance from the image-side surface of the optical filter GFto the imaging surface;

nd1: refractive index of the first lens L1;

nd2: refractive index of the second lens L2;

nd3: refractive index of the third lens L3;

nd4: refractive index of the fourth lens L4;

nd5: refractive index of the fifth lens L5;

ndg: refractive index of the optical filter GF;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

vg: abbe number of the optical filter GF.

TABLE 1 Focal length (mm) f 4 f1 3.013 f2 −7.642 f3 8.048 f4 −9.763 f53.787 f6 −2.407

TABLE 2 Thickness/ Curvature Distance Refractive radius (R) (d) indexAbbe number (mm) (mm) (nd) (νd) St St ∞ d0 = −0.254 L1 R1 1.41527 d1 =0.615 nd1 1.5441 ν1 56.12 R2 8.59299 d2 = 0.107 L2 R3 30.82747 d3 =0.247 nd2 1.6510 ν2 21.51 R4 4.30034 d4 = 0.231 L3 R5 7.90033 d5 = 0.388nd3 1.5441 ν3 56.12 R6 −9.72409 d6 = 0.436 L4 R7 −1.66949 d7 = 0.247 nd41.6510 ν4 21.51 R8 −2.38997 d8 = 0.035 L5 R9 4.37826 d9 = 0.340 nd51.5441 ν5 56.12 R10 −3.80985 d10 = 0.249 L6 R11 −1.67489 d11 = 0.390 nd61.5352 ν6 56.12 R12 6.12142 d12 = 0.200 GF R13 ∞ d13 = 0.210 ndg 1.5168νg 64.17 R14 ∞ d14 = 0.609

Table 3 shows data of aspheric surface of each lens in the opticalcamera lens 10 according to Embodiment 1 of the present disclosure.

TABLE 3 Cone coefficient Aspheric surface coefficient k A4 A6 A8 A10 A12A14 A16 R1 −2.0530E+00 6.6057E−02 5.4640E−02 −2.8280E−01 6.8062E−01−8.6535E−01 5.0496E−01 −1.1589E−01 R2 5.9612E+01 −1.1656E−01 2.9910E−022.1219E−01 −4.7271E−01 1.9695E−01 1.6556E−01 −1.1695E−01 R3 1.0013E+02−1.7474E−01 3.4556E−01 −1.8715E−01 −6.2346E−02 −1.2913E−01 4.5961E−01−2.4227E−01 R4 −3.3348E+00 −1.1300E−01 3.0884E−01 −1.7186E−01−1.4637E−01 2.6331E−01 −2.3598E−02 −5.3790E−02 R5 −4.7376E+01−8.7812E−02 1.6010E−03 −1.0095E−01 1.1486E−01 −2.7895E−02 −1.0069E−013.1066E−02 R6 2.5284E+01 −4.2172E−02 −6.6776E−02 −1.3635E−01 1.8399E−01−1.2846E−01 4.9992E−03 6.5972E−03 R7 −1.5533E+01 −6.0105E−02 1.0171E−01−5.0543E−01 5.4676E−01 −5.1659E−01 3.7457E−01 −2.6456E−01 R8 −2.3592E+00−2.2738E−02 −3.8180E−02 6.8981E−02 −1.0922E−01 7.1579E−02 −4.6758E−022.1943E−02 R9 −1.8628E+01 −3.3555E−01 3.5099E−02 −7.5204E−03 −9.6258E−037.3190E−03 8.2160E−03 −4.9895E−03 R10 −8.7998E+01 −3.3825E−02−3.9260E−02 2.2246E−02 −4.2054E−03 1.8736E−03 −6.2953E−04 −8.5216E−06R11 −3.6077E+00 4.6337E−02 −2.1763E−02 8.1098E−03 −7.9336E−04−1.5017E−04 −1.3941E−05 8.6157E−06 R12 −1.1303E+02 −3.6199E−02−1.1371E−02 6.5203E−03 −1.4905E−03 2.2246E−04 −3.1679E−05 2.6267E−06

Table 4 and Table 5 show the design data of inflection point andstationary point of each lens in the optical camera lens 10 according toEmbodiment 1 of the present disclosure. R1, R2 respectively representthe object-side surface and the image-side surface of the first lens L1;R3, R4 respectively represent the object-side surface and the image-sidesurface of the second lens L2; R5, R6 respectively represent theobject-side surface and the image-side surface of the third lens L3; R7,R8 respectively represent the object-side surface and the image-sidesurface of the fourth lens L4; R9, R10 respectively represent theobject-side surface and the image-side surface of the fifth lens L5; andR11, R12 respectively represent the object-side surface and theimage-side surface of the sixth lens L6.

TABLE 4 Number of Position 1 of the Position 2 of the inflection pointinflection point inflection point R1 1 0.895 R2 1 0.335 R3 2 0.135 0.535R4 0 R5 1 0.325 R6 0 R7 0 R8 0 R9 1 0.235 R10 0 R11 1 0.945 R12 1 0.425

TABLE 5 Number of the Position 1 of the Position 2 of the stationarypoint stationary point stationary point R1 0 R2 1 0.645 R3 2 0.235 0.715R4 0 R5 1 0.535 R6 0 R7 0 R8 0 R9 1 0.405 R10 0 R11 0 R12 1 0.765

FIG. 2 and FIG. 3 respectively show the schematic diagram of the axialchromatic aberration and ratio chromatic aberration of the opticalcamera lens 10 according to Embodiment 1 after light with a respectivewave length of 486 nm, 588 nm and 656 nm passing through the opticalcamera lens 10. FIG. 4 shows the schematic diagram of the astigmatismfield curvature and distortion of the optical camera lens 10 accordingto Embodiment 1 after light with a wave length of 588 nm passing throughthe optical camera lens 10.

The following Table 6 lists values with respect to each conditionalexpression in the present embodiment according to the above conditionalexpressions. Obviously, the optical camera system of the presentembodiment satisfies the above conditional expressions.

TABLE 6 Conditions Embodiment 1 0.7 < f1/f < 0.8 0.75325 1.9 < f3/f <2.1 2.012   −2 < f2/f < −1.8 −1.9105 −2.6 < f4/f < −2.2 −2.44075 0.8 <f5/f < 1   0.94675 −0.7 < f6/f < −0.5 −0.60175  1.9 < f3/f5 < 2.22.12517

In the present embodiment, the entrance pupil diameter of the opticalcamera lens 10 is 2.14 mm, the image height of full field of view is2.619 mm, the field of view angle in the diagonal direction is 66.40°.

Person skilled in the art shall understand, the above implementingmanners show detailed embodiments of the present disclosure, however, inpractical application, various modifications may be made to the formsand details thereof, without departing from the spirit and scope of thepresent disclosure.

What is claimed is:
 1. An optical camera lens, from an object side to animage side, successively comprising: an aperture; a first lens havingpositive refraction power; a second lens having negative refractionpower; a third lens having positive refraction power; a fourth lenshaving negative refraction power; a fifth lens having positiverefraction power; and a sixth lens having negative refraction power;wherein a focal length of the integral optical camera lens is f, a focallength of the first lens is f1, a focal length of the second lens is f2,a focal length of the third lens is f3, a focal length of the fourthlens is f4, a focal length of the fifth lens is f5 and a focal length ofthe sixth lens is f6, which satisfy following relational expressions:7<f1/f<0.8; −2<f2/f<−1.8; 1.9<f3/f<2.1; −2.6<f4/f<−2.2; 0.8<f5/f<1;−0.7<f6/f<−0.5; 1.9<f3/f5<2.2.
 2. The optical camera lens as describedin claim 1, wherein the focal length f1 of the first lens, the focallength f2 of the second lens, the focal length f3 of the third lens, thefocal length f4 of the fourth lens, the focal length f5 of the fifthlens and the focal length f6 of the sixth lens satisfy followingrelational expressions, respectively: 2.9<f1<3.1; −8<f2<−7; 7.5<f3<8.5;−10.5<f4<−9; 3<f5<4; 3<f6<−2.
 3. The optical camera lens as described inclaim 1, wherein a refractive index n1 of the first lens, a refractiveindex n2 of the second lens, a refractive index n3 of the third lens, arefractive index n4 of the fourth lens, a refractive index n5 of thefifth lens and a refractive index n6 of the sixth lens satisfy followingrelational expressions, respectively: 1.52<n1<1.56; 1.62<n2<1.68;1.52<n3<1.56; 1.62<n4<1.68; 1.52<n5<1.56; 1.52<n6<1.54.
 4. The opticalcamera lens as described in claim 1, wherein an abbe number v1 of thefirst lens, an abbe number v2 of the second lens, an abbe number v3 ofthe third lens, an abbe number v4 of the fourth lens, an abbe number v5of the fifth lens and an abbe number v6 of the sixth lens satisfyfollowing relational expressions, respectively: 50<v1<60; 20<v2<23;50<v3<60; 20<v4<23; 50<v5<60; 50<v6<60.
 5. The optical camera lens asdescribed in claim 1, wherein a total track length of the optical cameralens is 4.3 mm.
 6. The optical camera lens as described in claim 1,wherein an aperture value F of the optical camera lens is equal to orless than 1.87.